The reason ______ he was late was unknown
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![The reason ______ he was late was unknown](/uploads/image/z/11564869-13-9.jpg?t=The+reason+______+he+was+late+was+unknown)
The reason ______ he was late was unknown
The reason ______ he was late was unknown
The reason ______ he was late was unknown
that
why
reason 做原因状语
why 他迟到的原因还是未知
定语从句 缺少关系副词 表示原因 用Why